Automatic dump body



M. E. TEAGUE AUTOMATIC DUMP BODY Feb. 1, 1949.

2 Sheets-Sheet 1 Filed May 8, 1945 3nventor M auranca ETEAQ UE us B (Ittorneg Feb. 1, 1949. M. E. TEAGUE 6 4 AUTOMATIC DUMP BODY Filed May 8, l945 2 Sheets-Sheet 2 3nnentor *6, mauilaimeua Wxm Ottorneg Patented Feb. 1, 1949 OFFICE I 2,450,403 I AUTOMATIC DUMP BODY V Maurice E. Teague, Cheney, Wash. Application May 8, 1945, Serial No. 592,673

This invention relates to an automatic dump bodyand, more particularly, is a dump body that will automatically dislodge and pass out the tail enda load of fiuid'materials under controlled spreading conditions.

It has been my experience with the truck bodies of the prior art that they require unnecessary attention from the drivers in the dislodgement of the load, especially from the front portion of the body and that they do not include practical or useful gate structures that can be operated merely by raising the body to dumping inclination.

Having these and other objections. of the prior art in mind, it is an object of this invention to provide a dump truck that will readilydislodge the forward portion ofthe load in an automatic manner without requiring hammering or prying by the attendant.

Another object of the invention is the provision, in a dump truck of the type mentioned, of an automatic tail-gate that will open a predetermined degree without requiring the operator to do other than to elevate the body to a suitable inclined position.

A still further object of the invention is to provide in a dump truck body a gate operating linkage system that will function automatically to open the tail gate when the body is raised to dumping inclination.

The foregoing objects and others ancillary thereto I prefer to accomplish as follows:

According to a preferred embodiment of my invention, I dispose within the front of a dump body an upright plate hinged near the top to the upper forward portion of the body and having hinged thereto a false bottom plate to lie within the forward bottom portion of the dump body. The rear gate of the body is formed of a plate provided with lateral extending trunnions at both the upper and the lower corners. The lower trunwhen the forward end of the lever is depressedthe fork and the depending gate is swung relative the opening that it normally closes. Mounted in the joists of the tiltable' body is a cross shaft carrying at each end a crank arm having a crank pin radially swingable about :said shaft. Between the crank pin and the gate lever is a link which operates to swing the lever when the crank is revolved. Movement of the crank and the cross shaft to which it is secured is obtained by-a pair of links between the main truck frame and the cross shaft. One of said links is pivoted to 2 Claims. (01. 298-43) ,larity in the appended claims.

the rnain frame and to the other link and the latter is secured as a crank arm to the cross shaft. Withthis arrangement, lifting of the dump body produces a depressing force upon the links connected to the forward ends of the gate levers and the gate is raised. Attached to the gate levers are sidewalls to close the sides of the opening produced when the gate-is raised during dumping.

' The novel features that I consider characteristic of .my-invention are set'forth with particu- The invention, however, both as to its organization and its method of operation, together with additional objects and advantages thereof, will best be understood from the following description of a specific embodiment when read in connection with the accompanying drawings, in which,

Fig. l is a'side elevation view of a dump truck body equipped according to my invention;

Fig. 2 is an enlarged longitudinal sectional view of the forward portion of the body in the lowered position and Fig. 3 is a similar view of the same in the elevated position;

Figure 4 is an enlarged side view of a rear fragment of the dump body with portions broken away and omitted for convenience of illustration;

Fig. 5 is a cross sectional view taken on line 5--5 of Fig.4;

Fig.6 is a detailed view of the links between the I main truck frame and the sub-frame whereby rotation of the cross shaft is obtained; and

Fig. 7 is a side view, in elevation, of the tail gate in elevated dumping position and the body inclined for dumping.

Referring to the drawings, there will be seen a truck main frame I!) that is normally supported upon ground engaging members (not shown). superposed upon frame ID are the body joists l2 upon which are mounted the dump body I4 comprising the normal bottom I5, front wall l6, and side walls I! and I8.

Between frames in and I2 is provided the pivot 20 whereby the two frames may be spread apart as shown from Fig. 1 to Fig. 7, usually by screw or expansible cylinder means of conventional use and not shown for convenience of illustration.

, In the forward portion of the body is placed the the center of gravity that it will freely run out of the body and thus obviate the heretofore necessary hammering, pounding and prying so commonly required of the operators to dislodge this portion of the load.

As can be seen in Fig. 5, the bottom It; is extended externally: of the sides to for mash'elf 'ltii and a web brace 35 extends therefrom to the'be'ad edge 32 to stifien the body. In the joists i2 lateral of the body is rotatably mounted cross shaft 3? which extends outward to under the shelves'im- Somewhere near the middle, shaft 34 has crank arm 36 which is pivotally coupled to'lhik-3T-that" is in turn pivoted to ear 38 thatisattached tothe frame Hi. When the body is elevated the action i of link 31 and arm 36 is to produce a sligfitrota"- tion of shaft 34, in a oounter clockwise direction as showninFigGL i Ateach end, shaft 35 hassecureditheletdthe crank plate 60 'Which'is providedwith a serlesof holes 4i to which link '44 may lee-sele tively 1 2:; tached at various radial distances 1 and positions from the axis of shaft 34 to vary'the draft-upon link 44 to meet-conditions of-useof the mech'a' nismw Links 44 each rise upwardly'frorri a icon- 1.2

nection with acrank plate 40 and pass th'rougha suitableslot dim-the shelf 30and 'lieal'ongside the outside adjacent'of-the body sidewall. An" angledron? lever 38 is pivoted "to athe -upp" edge of each 1 side wall" by- -means 'of1pi'i'r i9' and" has pivotal connection with the uppei 'end' of link When the body is-raised-pivot ill revdlves about -the axis-of pivot between frame illa'rid joists i2 as also does theshaft 34:1 Howeverjshaft 34' is itself rotated about itsown: axis: by means of crank 36 andlink 3?. This rotatidn of shaftfl results inswinging ofcrank plate 40 and'an accelerated draft is applied to the link="'ov'er" and beyond the action obtain-ableif link 44 were-attached only to the frame may afixed pivoti .Lever 45 carries depending therefrom'within the body a triangular: plate 53 whichiser ves ae a guide and also :a'sa side wallinth'e opening'pro ducedwhenthe tail'gateis'raised, at which time it rests against the rear edge of thetail-gdteSBk Onits rear end;-lever 48 has fork 5'd'in 'which is mounted an upper trunnion of the ta-ilgatefilii A pin :58 passed through the tines of fork zfl' re tam-the trunnion in the fork during lifting of the gate. I a

At each of the lower cornerswofthe gate a trunnion 5E WhlCh'lS normally-s'eatedinhookil carried by the rear lower 'cornersrof -.t"he'- clun'i body. -When his desired to drop the tail gat to non-upright position; pin' filliswithdrawrf" and such may be accomplishedwith the tail gate Withchains or being positioned-as is customary other stop means.

:By the tai'li gate elevating means; Zit is possible toelevate the same merely'by raising the dump body to any oi itsincline'd positions'i' Sincethe degree'oi'rais'e' of the' tail-gate rnay be controlledthrough adjustments inthebon nection of link id in any of the holes; the opf truck bottom arranged for, and .a desired. spreadwill.. be. had; Bulk material which "is not-so free flowing may require greater inclinationw iof the dump-body whilecstillvthe. same openingeisihadz In the latter case the operator merely adjusts his link connection to crank plate 40 and proceeds in the normal manner.

For normal use the tail gate is provided with the trunnions 60 extending beyond the two ends of the tail gate 56 and along the bottom edge. The trunnions seatin the hooked ends 6| and twin-game pins SSl'tHe' ta'il fgate isfree to sw' dutward and down 'ard stun arc of degrees or it may be fixed at the horizontal or any other degree by the usual chains commonly used for that purpose, thus providing fo'r .hauling material that has to extend or that is lon-ge'rthanthe capacity of the truck body.

' ----Althou gh---I- have shown and described certain specific embodiments of my invention, I am fully aware that many modifications thereof are possible. My invention, therefore, is to be limited onlyfby f'the spirit of the appended laims as equivalents obviously "cani'be substituted within 1 the skili ofithe mechanic 'without departing from the principles "of the invention; t

Having thus described my =imieiition, rc'laimz" In chimp body "that *is' pivotally' mounted upon a frame" and swings to inclined position reiativethere-toi tail gateelevating means; com:

prisnigz a tailigate to closesaid'bddy-sat the rear WheiYiiTth normal horizontal position; alever cennectd tos each upper corneriof said' body and" extending foitward' alongside said a dump body and having pivotal connectionthBI'GWith'fil'ltET- said-lever I 'for'wardmfits pivotalconnection to;

said bodynaguide plate'dep'ending irom said lever within said-body along the-side wall -thereof, said guide plate extending forward fromthe rear end oi s aid leyerya cross shaft lateral of said body therebelow and having a erank-plate-on-each end, each said link and the adjacent crank platebeing pivotaIly interconnected and crank me ans between said cross shaft and said frame,

2.111 a dump body that ispivot'allfmoiinted upon a frame, and swings to inclined'po's'itionrela tive ther eto, a tailgate to close' 'said'bodyat'the 'rearga lever extending "alongside said dump at each-side-thereof adiacent the top edge thereof and having pivotal connectionwith-said body at a distance from the tail gate-flinli iiiean's' "open able by elevation of said body to inclined'position to turn said- -leverson their pivotal" connections withthe body to el evate t he gate; said evee-tac having a triangular guide plate thereon extendm m e t m ifi i i ','efi w ii, wardl-yinside the body formin step for thegat'e;

rearwardlyfacing forks at therear-ends of said namedtrunnions; whereby the tairgate the bo dy islevel and lifted by saidlevels asth body is titled. 1.

are

"Thefollowing references are of record in the file of thisapatent: 1'.

.' TA E Number- Name-- Date' 1,

1,2,38,618 Raymond Dec-r24, 131 8;; Lew-2i. O n u flp fi 152513-384 Larson {Sept-1, 1931' 2,213,385 Dailey Sept. 3, 1940 

